# Physics

An electric immersion heater is rated 5 A when connected to a 120V circuit. What is the resistance of the heater? If it takes 168 KJ to heat 500 ml of water from 20 deg C to boiling, how long does it take to heat the water?

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1. R = V/I = 24 ohms
Power = V*I = 600 J/s

600*t = 168,000 J

Solve for t in seconds

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posted by drwls

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